/*
* The author disclaims copyright to this source code. In place of
* a legal notice, here is a blessing:
* 
* May you do good and not evil.
* May you find forgiveness for yourself and forgive others.
* May you share freely, never taking more than you give.
*
*/
package home.my.base.util;

import java.sql.Types;

import org.hibernate.Hibernate;
import org.hibernate.dialect.Dialect;
import org.hibernate.dialect.function.SQLFunctionTemplate;
import org.hibernate.dialect.function.StandardSQLFunction;
import org.hibernate.dialect.function.VarArgsSQLFunction;

public class SQLiteDialect extends Dialect {
public SQLiteDialect() {
    registerColumnType(Types.BIT, "integer");
    registerColumnType(Types.TINYINT, "tinyint");
    registerColumnType(Types.SMALLINT, "smallint");
    registerColumnType(Types.INTEGER, "integer");
    registerColumnType(Types.BIGINT, "bigint");
    registerColumnType(Types.FLOAT, "float");
    registerColumnType(Types.REAL, "real");
    registerColumnType(Types.DOUBLE, "double");
    registerColumnType(Types.NUMERIC, "numeric");
    registerColumnType(Types.DECIMAL, "decimal");
    registerColumnType(Types.CHAR, "char");
    registerColumnType(Types.VARCHAR, "text");
    registerColumnType(Types.VARCHAR, 255, "varchar($l)");
    registerColumnType(Types.LONGVARCHAR, "longvarchar");
    registerColumnType(Types.DATE, "datetime");
    registerColumnType(Types.TIME, "time");
    registerColumnType(Types.TIMESTAMP, "timestamp");
    registerColumnType(Types.BINARY, "blob");
    registerColumnType(Types.VARBINARY, "blob");
    registerColumnType(Types.LONGVARBINARY, "blob");
    // registerColumnType(Types.NULL, "null");
    registerColumnType(Types.BLOB, "blob");
    registerColumnType(Types.CLOB, "clob");
    registerColumnType(Types.BOOLEAN, "integer");

    registerFunction( "concat", new VarArgsSQLFunction(Hibernate.STRING, "", "||", "") );
    registerFunction( "mod", new SQLFunctionTemplate( Hibernate.INTEGER, "?1 % ?2" ) );
    registerFunction( "substr", new StandardSQLFunction("substr", Hibernate.STRING) );
    registerFunction( "substring", new StandardSQLFunction( "substr", Hibernate.STRING ) );
}

public boolean supportsIdentityColumns() {
    return true;
}

/*
public boolean supportsInsertSelectIdentity() {
return true; // As specify in NHibernate dialect
}
*/

public boolean hasDataTypeInIdentityColumn() {
    return false; // As specify in NHibernate dialect
}

/*
public String appendIdentitySelectToInsert(String insertString) {
return new StringBuffer(insertString.length()+30). // As specify in NHibernate dialect
append(insertString).
append("; ").append(getIdentitySelectString()).
toString();
}
*/

public String getIdentityColumnString() {
    // return "integer primary key autoincrement";
    return "integer";
}

public String getIdentitySelectString() {
    return "select last_insert_rowid()";
}

public boolean supportsLimit() {
    return true;
}

protected String getLimitString(String query, boolean hasOffset) {
    return new StringBuffer(query.length()+20).
    append(query).
    append(hasOffset ? " limit ? offset ?" : " limit ?").
    toString();
}

public boolean supportsTemporaryTables() {
    return true;
}

public String getCreateTemporaryTableString() {
    return "create temporary table if not exists";
}

public boolean dropTemporaryTableAfterUse() {
    return false;
}

public boolean supportsCurrentTimestampSelection() {
    return true;
}

public boolean isCurrentTimestampSelectStringCallable() {
    return false;
}

public String getCurrentTimestampSelectString() {
    return "select current_timestamp";
}

public boolean supportsUnionAll() {
    return true;
}

public boolean hasAlterTable() {
    return false; // As specify in NHibernate dialect
}

public boolean dropConstraints() {
    return false;
}

public String getAddColumnString() {
    return "add column";
}

public String getForUpdateString() {
    return "";
}

public boolean supportsOuterJoinForUpdate() {
    return false;
}

public String getDropForeignKeyString() {
    throw new UnsupportedOperationException("No drop foreign key syntax supported by SQLiteDialect");
}

public String getAddForeignKeyConstraintString(String constraintName,
    String[] foreignKey, String referencedTable, String[] primaryKey,
    boolean referencesPrimaryKey) {
    throw new UnsupportedOperationException("No add foreign key syntax supported by SQLiteDialect");
}

public String getAddPrimaryKeyConstraintString(String constraintName) {
    throw new UnsupportedOperationException("No add primary key syntax supported by SQLiteDialect");
}

public boolean supportsIfExistsBeforeTableName() {
    return true;
}

public boolean supportsCascadeDelete() {
    return false;
}
}